Preparation method of rice straw-acrylic acid-acrylamide graft copolymer

A technology of graft copolymer and acrylamide, which is applied in the field of preparation of rice straw-acrylic acid-acrylamide graft copolymer, which can solve the problems of low ratio of three-dimensional network structure, weak controlled release of fertilizer, and few grafting sites, etc. problem, to achieve the effect of no chemical reagent residue, high degree of cross-linking, and uniform grafting

Inactive Publication Date: 2018-01-05
CHIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cellulose contains a large number of hydrogen bonds, which form crystallized regions and are difficult to destroy. Cellulose is connected by β-1.4 glycosidic bonds, so it is impossible to destroy hydrogen bonds through heating and gelatinization. Therefore, when using straw graft copolymerization, small molecular monomers It can only touch 10%~15% of the sugar rings on the surface of cellulose molecules, and the inner sugar rings of cellulose cannot be in contact with them. There are fewer grafting sites, uneven grafting, low degree of crosslinking, and three-dimensional network The ratio of the shape structure is relatively low, resulting in poor water absorption and weak controlled release of fertilizers. For example, the water-absorbing resin prepared by using sunflower straw powder can only absorb 293 times of deionized water.

Method used

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  • Preparation method of rice straw-acrylic acid-acrylamide graft copolymer
  • Preparation method of rice straw-acrylic acid-acrylamide graft copolymer
  • Preparation method of rice straw-acrylic acid-acrylamide graft copolymer

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: Preparation of a kind of rice straw-acrylic acid-acrylamide graft copolymer

[0034] 1.1 Main raw materials, reagents and instruments

[0035] Rice straw (Hefei); acrylic acid (AA, analytical grade); acrylamide (AM, analytical grade); sodium hydroxide (NaOH, analytical grade); 0.9% NaCl solution; urea (Urea); Base bisacrylamide (analytical pure), FeSO4 • 7H2O (analytical pure).

[0036] 60Co-γ irradiation source, Hefei (National) Forestry Irradiation Center, activity 200,000 Ci, single grid shape, absorption metering rate is calibrated by dichromate dosimeter; SYC-15 constant temperature water bath (Hebei, Run United Technology Co., Ltd.); WK-150A Superfine Grinder (Jinan, Dawei Machinery Co., Ltd.); 8700 Fourier Transform Infrared Spectrometer (FTIR, America, ThermoNicolet Company); D / X-2800 X-ray Powder diffractometer (XRD, Dandong, Haoyuan Instrument Co., Ltd.).

[0037] 1.2 Preparation of rice straw-acrylic acid-acrylamide graft copolymer

[0038] ...

Embodiment 2

[0058] Embodiment 2: Results and analysis

[0059] 2.1. XRD analysis

[0060] In the range of 2θ angles, figure 1 The straw powder without decrystallization has a relatively narrow diffraction peak at 22.38, indicating that the straw powder without decrystallization contains a lot of hydrogen bonds. Figure 2 shows the straw powder treated with NaOH / Urea aqueous solution. A wider dispersion peak was formed in the range of 2θ angle, which indicated that the regular crystallization area between the macromolecular chains in the straw was destroyed during the decrystallization treatment, and the amorphous area increased. image 3 It is the XRD pattern of urea, showing that urea is crystal, Figure 4 It is the XRD pattern of the graft copolymer, and the width of the dispersion peak further increases, indicating that after the straw is irradiated and grafted and copolymerized in the solution state, the crystalline region becomes an amorphous region. It shows that the macromolecu...

Embodiment 3

[0078] Example 3: Preparation of another rice straw-acrylic acid-acrylamide graft copolymer

[0079] Measure 100ml of deionized water, take 3ml of AA, add 4g of AM powder, measure 0.5g of the above-mentioned decrystallized straw powder in a beaker, stir well, add 0.2g of polymerization inhibitor FeSO 4 7H2O, add 0.2g N,N'-methylenebisacrylamide at the same time, stir well, and send it to the irradiation workshop;

[0080] Other steps are identical with embodiment 1.

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Abstract

The invention provides a preparation method of a rice straw-acrylic acid-acrylamide graft copolymer, and relates to the technical field of preparation methods of super absorbent resin. Decrystallization of rice straw is firstly carried out, AA and AM powder, a polymerization inhibitor FeSO4.7H2O, and N,N'-methylenebisacrylamide are added into water with uniform stirring, irradiation polymerizationand sample purification are carried out, the super absorbent rice straw-acrylic acid-acrylamide graft copolymer is prepared, and comprehensive utilization of straw is realized.

Description

technical field [0001] The invention relates to a preparation method of an agricultural water-retaining agent with a high salt water absorption rate, in particular to a preparation method of a rice straw-acrylic acid-acrylamide graft copolymer. Background technique [0002] Rice straw is one of the main crop straws in my country. It has the advantages of high yield and renewable [1]. The environment has produced serious pollution and wasted a lot of resources [2-4]. Rice straw contains up to 35% cellulose [5, 6]. Cellulose macromolecules are polymerized from monosaccharides, with a high degree of polymerization, superhelical, chain-like, and a large number of hydrogen bonds between molecular chains [7- 9]. [0003] Superabsorbent resin (SAR), the structure is a three-dimensional network with uniform crosslinking degree, and contains hydrophilic hydroxyl groups, amino groups, etc. inside, and also contains groups that can enhance osmotic pressure such as sodium carboxylate t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F289/00C08F220/06C08F220/56C08F222/38C08F2/46
Inventor 郭军
Owner CHIZHOU UNIV
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